Slough · England
Sand mastic for sash & case windows in Longford, Slough
Professional sand mastic in and around Longford, with old sealant always removed completely and a 12-month guarantee.
- Cracked mastic round a front door frame
- Crumbling sand mastic round a window
- Failed mastic on an exposed elevation
How we handle sand mastic in Longford
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, and new mastic is applied and shaped by hand. We work on stone surrounds, tenement windows and period & listed homes, and people most often call us about gaps round a timber door in stone or brick and old sand mastic that has cracked, crumbled or fallen out.
Around Longford, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Longford (SL3, UB7, TW6)
- Region
- Slough
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Longford
Can you help a landlord with a rental near Heathrow Terminal 5 Rail station?
Yes. We work for letting agents and landlords as well as householders. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Can you do sand mastic in Longford?
Yes, Longford is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Can old silicone round a sash window be swapped for sand mastic?
Generally, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Do you do commercial work?
Yes. We can plan bigger jobs in stages to suit the site.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
How do I get a quote for sand mastic in Longford?
Size, access and the old material all affect the cost. Call for a quick quote.
Sand mastic in Longford: local notes
Historic houses like Frogmore House (about 4.3 miles west) are a reminder that the area around Longford has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Pippins School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Heathrow Terminal 5 Rail station? Then any sash windows need sound mastic to keep draughts and rain out.
Longford is about 2 miles south-west of West Drayton, in Slough. Every kind of property in Longford can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 31 places across Slough, from the larger towns to small villages. For nearby work, see our London page.
Postcode districts we cover here for sand mastic: SL3, UB7 and TW6. If you need sand mastic at a property on Wallis Road, Widgeon Road and Stanwell Moor Road or anywhere close by, we can help. Longford is on the A3044, so it’s easy for us to get to. We also cover the places around Longford: Harmondsworth (1 mile north-east), Stanwell (2 miles south-east), Heathrow (2 miles east), Sipson (2 miles north-east) and West Bedfont (2 miles south-east). Further out, we also cover Slough (6 miles north-west), Cippenham (7 miles north-west), Chalvey (5 miles west), Britwell (7 miles north-west), Langley (3 miles north-west) and Upton (5 miles north-west).
Near you in Longford
Typical jobs here are in homes near The Kings Arms and Arthur Jacob Nature Reserve. For rail, the closest station is Heathrow Terminal 5 Rail station, about 0.5 miles south-east. A little further out are Windsor Castle (4.8 miles west) and Harlington (2.1 miles north-east). Green spaces nearby include Crane Meadows and Staines Reservoirs.
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Where a wall is exposed, as many are in small places like Longford, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Why us?
- 12-month guarantee on every job
- Anti-fungal silicone where joints get wet
- Tidy, careful work
- Any old sealant cut out fully, not covered over
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Towns and villages near Longford
More services for Longford
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Different surfaces, different methods
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. We shape it by hand to follow the stone.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Keeping the joints in good condition
Looking after new joints is easy:
- Don’t paint over the new mastic
- Find out about consent before window work on a listed home
- Have rotten timber repaired before new mastic goes in
- Sort the mastic before the decorators arrive
Leave the new mastic alone while it firms up. It skins over quickly, but takes longer to harden fully.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to a full day, depending on how many windows, including the tidy-up. In a small place like Longford, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or email us.
Related advice
How we quote for sand mastic
Jobs vary more than people expect. The main factors:
- When we can work, for business premises
- How many areas need sealing
- The type of sealant required
- Whether the work is at height
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
What to tell us for a quote
When you contact us, it’s useful to know:
- Where the property is
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or send us an email with the details.